494 lines
15 KiB
Python
494 lines
15 KiB
Python
from __future__ import print_function
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import struct
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import sys
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import gdb.printing
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import gdb.types
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class Iterator:
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def __iter__(self):
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return self
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if sys.version_info.major == 2:
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def next(self):
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return self.__next__()
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def children(self):
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return self
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def escape_bytes(val, l):
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return '"' + val.string(encoding='Latin-1', length=l).encode('unicode_escape').decode() + '"'
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class SmallStringPrinter:
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"""Print an llvm::SmallString object."""
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def __init__(self, val):
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self.val = val
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def to_string(self):
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begin = self.val['BeginX']
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return escape_bytes(begin.cast(gdb.lookup_type('char').pointer()), self.val['Size'])
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class StringRefPrinter:
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"""Print an llvm::StringRef object."""
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def __init__(self, val):
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self.val = val
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def to_string(self):
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return escape_bytes(self.val['Data'], self.val['Length'])
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class SmallVectorPrinter(Iterator):
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"""Print an llvm::SmallVector object."""
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def __init__(self, val):
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self.val = val
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t = val.type.template_argument(0).pointer()
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self.begin = val['BeginX'].cast(t)
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self.size = val['Size']
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self.i = 0
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def __next__(self):
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if self.i == self.size:
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raise StopIteration
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ret = '[{}]'.format(self.i), (self.begin+self.i).dereference()
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self.i += 1
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return ret
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def to_string(self):
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return 'llvm::SmallVector of Size {}, Capacity {}'.format(self.size, self.val['Capacity'])
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def display_hint (self):
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return 'array'
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class ArrayRefPrinter:
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"""Print an llvm::ArrayRef object."""
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class _iterator:
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def __init__(self, begin, end):
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self.cur = begin
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self.end = end
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self.count = 0
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def __iter__(self):
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return self
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def __next__(self):
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if self.cur == self.end:
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raise StopIteration
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count = self.count
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self.count = self.count + 1
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cur = self.cur
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self.cur = self.cur + 1
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return '[%d]' % count, cur.dereference()
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if sys.version_info.major == 2:
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next = __next__
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def __init__(self, val):
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self.val = val
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def children(self):
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data = self.val['Data']
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return self._iterator(data, data + self.val['Length'])
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def to_string(self):
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return 'llvm::ArrayRef of length %d' % (self.val['Length'])
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def display_hint (self):
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return 'array'
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class ExpectedPrinter(Iterator):
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"""Print an llvm::Expected object."""
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def __init__(self, val):
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self.val = val
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def __next__(self):
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val = self.val
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if val is None:
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raise StopIteration
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self.val = None
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if val['HasError']:
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return ('error', val['ErrorStorage'].address.cast(
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gdb.lookup_type('llvm::ErrorInfoBase').pointer()).dereference())
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return ('value', val['TStorage'].address.cast(
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val.type.template_argument(0).pointer()).dereference())
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def to_string(self):
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return 'llvm::Expected{}'.format(' is error' if self.val['HasError'] else '')
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class OptionalPrinter(Iterator):
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"""Print an llvm::Optional object."""
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def __init__(self, val):
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self.val = val
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def __next__(self):
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val = self.val
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if val is None:
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raise StopIteration
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self.val = None
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if not val['Storage']['hasVal']:
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raise StopIteration
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return ('value', val['Storage']['value'])
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def to_string(self):
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return 'llvm::Optional{}'.format('' if self.val['Storage']['hasVal'] else ' is not initialized')
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class DenseMapPrinter:
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"Print a DenseMap"
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class _iterator:
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def __init__(self, key_info_t, begin, end):
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self.key_info_t = key_info_t
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self.cur = begin
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self.end = end
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self.advancePastEmptyBuckets()
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self.first = True
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def __iter__(self):
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return self
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def advancePastEmptyBuckets(self):
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# disabled until the comments below can be addressed
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# keeping as notes/posterity/hints for future contributors
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return
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n = self.key_info_t.name
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is_equal = gdb.parse_and_eval(n + '::isEqual')
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empty = gdb.parse_and_eval(n + '::getEmptyKey()')
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tombstone = gdb.parse_and_eval(n + '::getTombstoneKey()')
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# the following is invalid, GDB fails with:
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# Python Exception <class 'gdb.error'> Attempt to take address of value
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# not located in memory.
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# because isEqual took parameter (for the unsigned long key I was testing)
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# by const ref, and GDB
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# It's also not entirely general - we should be accessing the "getFirst()"
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# member function, not the 'first' member variable, but I've yet to figure
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# out how to find/call member functions (especially (const) overloaded
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# ones) on a gdb.Value.
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while self.cur != self.end and (is_equal(self.cur.dereference()['first'], empty) or is_equal(self.cur.dereference()['first'], tombstone)):
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self.cur = self.cur + 1
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def __next__(self):
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if self.cur == self.end:
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raise StopIteration
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cur = self.cur
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v = cur.dereference()['first' if self.first else 'second']
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if not self.first:
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self.cur = self.cur + 1
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self.advancePastEmptyBuckets()
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self.first = True
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else:
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self.first = False
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return 'x', v
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if sys.version_info.major == 2:
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next = __next__
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def __init__(self, val):
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self.val = val
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def children(self):
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t = self.val.type.template_argument(3).pointer()
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begin = self.val['Buckets'].cast(t)
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end = (begin + self.val['NumBuckets']).cast(t)
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return self._iterator(self.val.type.template_argument(2), begin, end)
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def to_string(self):
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return 'llvm::DenseMap with %d elements' % (self.val['NumEntries'])
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def display_hint(self):
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return 'map'
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class StringMapPrinter:
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"Print a StringMap"
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def __init__(self, val):
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self.val = val
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def children(self):
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it = self.val['TheTable']
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end = (it + self.val['NumBuckets'])
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value_ty = self.val.type.template_argument(0)
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entry_base_ty = gdb.lookup_type('llvm::StringMapEntryBase')
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tombstone = gdb.parse_and_eval('llvm::StringMapImpl::TombstoneIntVal');
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while it != end:
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it_deref = it.dereference()
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if it_deref == 0 or it_deref == tombstone:
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it = it + 1
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continue
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entry_ptr = it_deref.cast(entry_base_ty.pointer())
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entry = entry_ptr.dereference()
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str_len = entry['keyLength']
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value_ptr = (entry_ptr + 1).cast(value_ty.pointer())
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str_data = (entry_ptr + 1).cast(gdb.lookup_type('uintptr_t')) + max(value_ty.sizeof, entry_base_ty.alignof)
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str_data = str_data.cast(gdb.lookup_type('char').const().pointer())
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string_ref = gdb.Value(struct.pack('PN', int(str_data), int(str_len)), gdb.lookup_type('llvm::StringRef'))
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yield 'key', string_ref
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value = value_ptr.dereference()
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yield 'value', value
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it = it + 1
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def to_string(self):
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return 'llvm::StringMap with %d elements' % (self.val['NumItems'])
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def display_hint(self):
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return 'map'
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class TwinePrinter:
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"Print a Twine"
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def __init__(self, val):
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self._val = val
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def display_hint(self):
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return 'string'
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def string_from_pretty_printer_lookup(self, val):
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'''Lookup the default pretty-printer for val and use it.
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If no pretty-printer is defined for the type of val, print an error and
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return a placeholder string.'''
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pp = gdb.default_visualizer(val)
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if pp:
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s = pp.to_string()
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# The pretty-printer may return a LazyString instead of an actual Python
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# string. Convert it to a Python string. However, GDB doesn't seem to
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# register the LazyString type, so we can't check
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# "type(s) == gdb.LazyString".
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if 'LazyString' in type(s).__name__:
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s = s.value().address.string()
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else:
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print(('No pretty printer for {} found. The resulting Twine ' +
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'representation will be incomplete.').format(val.type.name))
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s = '(missing {})'.format(val.type.name)
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return s
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def is_twine_kind(self, kind, expected):
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if not kind.endswith(expected):
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return False
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# apparently some GDB versions add the NodeKind:: namespace
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# (happens for me on GDB 7.11)
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return kind in ('llvm::Twine::' + expected,
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'llvm::Twine::NodeKind::' + expected)
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def string_from_child(self, child, kind):
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'''Return the string representation of the Twine::Child child.'''
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if self.is_twine_kind(kind, 'EmptyKind') or self.is_twine_kind(kind, 'NullKind'):
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return ''
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if self.is_twine_kind(kind, 'TwineKind'):
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return self.string_from_twine_object(child['twine'].dereference())
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if self.is_twine_kind(kind, 'CStringKind'):
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return child['cString'].string()
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if self.is_twine_kind(kind, 'StdStringKind'):
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val = child['stdString'].dereference()
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return self.string_from_pretty_printer_lookup(val)
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if self.is_twine_kind(kind, 'StringRefKind'):
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val = child['stringRef'].dereference()
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pp = StringRefPrinter(val)
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return pp.to_string()
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if self.is_twine_kind(kind, 'SmallStringKind'):
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val = child['smallString'].dereference()
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pp = SmallStringPrinter(val)
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return pp.to_string()
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if self.is_twine_kind(kind, 'CharKind'):
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return chr(child['character'])
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if self.is_twine_kind(kind, 'DecUIKind'):
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return str(child['decUI'])
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if self.is_twine_kind(kind, 'DecIKind'):
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return str(child['decI'])
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if self.is_twine_kind(kind, 'DecULKind'):
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return str(child['decUL'].dereference())
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if self.is_twine_kind(kind, 'DecLKind'):
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return str(child['decL'].dereference())
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if self.is_twine_kind(kind, 'DecULLKind'):
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return str(child['decULL'].dereference())
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if self.is_twine_kind(kind, 'DecLLKind'):
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return str(child['decLL'].dereference())
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if self.is_twine_kind(kind, 'UHexKind'):
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val = child['uHex'].dereference()
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return hex(int(val))
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print(('Unhandled NodeKind {} in Twine pretty-printer. The result will be '
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'incomplete.').format(kind))
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return '(unhandled {})'.format(kind)
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def string_from_twine_object(self, twine):
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'''Return the string representation of the Twine object twine.'''
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lhs_str = ''
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rhs_str = ''
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lhs = twine['LHS']
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rhs = twine['RHS']
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lhs_kind = str(twine['LHSKind'])
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rhs_kind = str(twine['RHSKind'])
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lhs_str = self.string_from_child(lhs, lhs_kind)
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rhs_str = self.string_from_child(rhs, rhs_kind)
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return lhs_str + rhs_str
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def to_string(self):
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return self.string_from_twine_object(self._val)
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def get_pointer_int_pair(val):
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"""Get tuple from llvm::PointerIntPair."""
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info_name = val.type.template_argument(4).strip_typedefs().name
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# Note: this throws a gdb.error if the info type is not used (by means of a
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# call to getPointer() or similar) in the current translation unit.
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enum_type = gdb.lookup_type(info_name + '::MaskAndShiftConstants')
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enum_dict = gdb.types.make_enum_dict(enum_type)
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ptr_mask = enum_dict[info_name + '::PointerBitMask']
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int_shift = enum_dict[info_name + '::IntShift']
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int_mask = enum_dict[info_name + '::IntMask']
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pair_union = val['Value']
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pointer = (pair_union & ptr_mask)
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value = ((pair_union >> int_shift) & int_mask)
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return (pointer, value)
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class PointerIntPairPrinter:
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"""Print a PointerIntPair."""
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def __init__(self, pointer, value):
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self.pointer = pointer
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self.value = value
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def children(self):
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yield ('pointer', self.pointer)
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yield ('value', self.value)
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def make_pointer_int_pair_printer(val):
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"""Factory for an llvm::PointerIntPair printer."""
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try:
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pointer, value = get_pointer_int_pair(val)
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except gdb.error:
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return None # If PointerIntPair cannot be analyzed, print as raw value.
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pointer_type = val.type.template_argument(0)
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value_type = val.type.template_argument(2)
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return PointerIntPairPrinter(pointer.cast(pointer_type),
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value.cast(value_type))
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class PointerUnionPrinter:
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"""Print a PointerUnion."""
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def __init__(self, pointer):
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self.pointer = pointer
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def children(self):
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yield ('pointer', self.pointer)
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def to_string(self):
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return "Containing %s" % self.pointer.type
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def make_pointer_union_printer(val):
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"""Factory for an llvm::PointerUnion printer."""
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try:
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pointer, value = get_pointer_int_pair(val['Val'])
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except gdb.error:
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return None # If PointerIntPair cannot be analyzed, print as raw value.
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pointer_type = val.type.template_argument(int(value))
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return PointerUnionPrinter(pointer.cast(pointer_type))
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class IlistNodePrinter:
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"""Print an llvm::ilist_node object."""
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def __init__(self, val):
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impl_type = val.type.fields()[0].type
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base_type = impl_type.fields()[0].type
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derived_type = val.type.template_argument(0)
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def get_prev_and_sentinel(base):
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# One of Prev and PrevAndSentinel exists. Depending on #defines used to
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# compile LLVM, the base_type's template argument is either true of false.
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if base_type.template_argument(0):
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return get_pointer_int_pair(base['PrevAndSentinel'])
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return base['Prev'], None
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# Casts a base_type pointer to the appropriate derived type.
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def cast_pointer(pointer):
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sentinel = get_prev_and_sentinel(pointer.dereference())[1]
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pointer = pointer.cast(impl_type.pointer())
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if sentinel:
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return pointer
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return pointer.cast(derived_type.pointer())
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# Repeated cast becaue val.type's base_type is ambiguous when using tags.
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base = val.cast(impl_type).cast(base_type)
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(prev, sentinel) = get_prev_and_sentinel(base)
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prev = prev.cast(base_type.pointer())
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self.prev = cast_pointer(prev)
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self.next = cast_pointer(val['Next'])
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self.sentinel = sentinel
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def children(self):
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if self.sentinel:
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yield 'sentinel', 'yes'
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yield 'prev', self.prev
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yield 'next', self.next
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class IlistPrinter:
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"""Print an llvm::simple_ilist or llvm::iplist object."""
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def __init__(self, val):
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self.node_type = val.type.template_argument(0)
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sentinel = val['Sentinel']
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# First field is common base type of sentinel and ilist_node.
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base_type = sentinel.type.fields()[0].type
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self.sentinel = sentinel.address.cast(base_type.pointer())
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def _pointers(self):
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pointer = self.sentinel
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while True:
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pointer = pointer['Next'].cast(pointer.type)
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if pointer == self.sentinel:
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return
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yield pointer.cast(self.node_type.pointer())
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def children(self):
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for k, v in enumerate(self._pointers()):
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yield ('[%d]' % k, v.dereference())
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pp = gdb.printing.RegexpCollectionPrettyPrinter("LLVMSupport")
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pp.add_printer('llvm::SmallString', '^llvm::SmallString<.*>$', SmallStringPrinter)
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pp.add_printer('llvm::StringRef', '^llvm::StringRef$', StringRefPrinter)
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pp.add_printer('llvm::SmallVectorImpl', '^llvm::SmallVector(Impl)?<.*>$', SmallVectorPrinter)
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pp.add_printer('llvm::ArrayRef', '^llvm::(Mutable)?ArrayRef<.*>$', ArrayRefPrinter)
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pp.add_printer('llvm::Expected', '^llvm::Expected<.*>$', ExpectedPrinter)
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pp.add_printer('llvm::Optional', '^llvm::Optional<.*>$', OptionalPrinter)
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pp.add_printer('llvm::DenseMap', '^llvm::DenseMap<.*>$', DenseMapPrinter)
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pp.add_printer('llvm::StringMap', '^llvm::StringMap<.*>$', StringMapPrinter)
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pp.add_printer('llvm::Twine', '^llvm::Twine$', TwinePrinter)
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pp.add_printer('llvm::PointerIntPair', '^llvm::PointerIntPair<.*>$', make_pointer_int_pair_printer)
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pp.add_printer('llvm::PointerUnion', '^llvm::PointerUnion<.*>$', make_pointer_union_printer)
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pp.add_printer('llvm::ilist_node', '^llvm::ilist_node<.*>$', IlistNodePrinter)
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pp.add_printer('llvm::iplist', '^llvm::iplist<.*>$', IlistPrinter)
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pp.add_printer('llvm::simple_ilist', '^llvm::simple_ilist<.*>$', IlistPrinter)
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gdb.printing.register_pretty_printer(gdb.current_objfile(), pp)
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